Electric fan



FIG. 1 is a perspective view of an electric fan showing the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines illustrate portions of the electric fan that form no part of the claimed design. 

CLAIM The ornamental design for an electric fan, as shown and described. 